ENVIRONMENTAL CONDITIONS - ALTITUDE 1

Question 1

Air at any level contains how much % of

• O2
• N
• CO2

Answer 1

O2 = 20.93%
N = 79.04%
CO2 = 0.03%

Question 2

At altitude, there is a reduction in the what?

Answer 2

Pressure of O2 entering the lungs

Question 3

This reduces the pressure differential between the alveoli and the capillaries resulting in what?

Answer 3

• Resulting in less O2 diffusing from the alveoli into the blood.

Question 4

Define concentration gradient

Answer 4

Gas exchange takes place due to a concentration difference

Question 5

OXYGEN move from *what into the *what which surround them

Answer 5

• alveoli of the lungs
• Capillaries

Question 6

CARBON DIOXIDE moves from *what into the *what to be what

Answer 6

• alveoli
• to be expired

Question 7

OXYGEN moves from a *what to the *what where they are of *what

Answer 7

• high concentration in the alveoli
• to the capillaries where they are of low concentration

Question 8

At sea level, O2 has a partial pressure of

Answer 8

159 mmHg

Question 9

At Mt Everest, O2 has a partial pressure of

Answer 9

48mmHg

Question 10

In surrounding venous blood, O2 has a partial pressure of

Answer 10

47mmHg at any altitude

Question 11

So at sea level pressure difference is which means diffusion is what?

Answer 11

159-47 = 112mmHg
Diffusion is easy

Question 12

So on Mt Everest pressure difference is which means diffusion is what?

Answer 12

48-47 = 1mmHg
Diffusion is nearly impossible